Betsy

From the experts:

This Elizabeth nickname has a decidedly retro feel--think Betsy Ross and the Betsy Wetsy doll-- once seen as a perkier, younger-sounding alternative to Betty. But with Betty on the brink of a comeback, pigtailed Betsy could return as well.

Betsy's height of popularity was from the forties to the sixties, when she was likely to be the radio, film or TV teenaged daughter.

Betsy, spelled Betsey, was a Dickens favorite, appearing in both David Copperfield (in which Aunt Betsey had wanted David to be named after her had he been a girl) and The Pickwick Papers.